LTC2389-18 - 18-Bit, 2.5Msps SAR ADC with Pin-Configurable Analog Input Range and 99.8dB SNR


  • 2.5Msps Throughput Rate
  • ±3LSB INL (Max)
  • Guaranteed 18-Bit, No Missing Codes
  • Pin-Configurable Analog Input Range:
    ±4.096V Fully Differential
    0V to 4.096V Pseudo-Differential Unipolar
    ±2.048V Pseudo-Differential Bipolar
  • 99.8dB (Fully Differential)/95.2dB (Pseudo Differential) SNR (Typ) at fIN = 2kHz
  • –116dB (Fully Differential)/–112dB (Pseudo Differential) THD (Typ) at fIN = 2kHz
  • Guaranteed Operation to 125°C
  • Single 5V Supply
  • Internal 20ppm/°C (Max) Reference
  • Internal Reference Buffer
  • 162.5mW Power Dissipation at 2.5Msps
  • No Pipeline Delay, No Cycle Latency
  • 1.8V to 5V I/O Voltages
  • Parallel and Serial I/O Interface
  • 48-pin 7mm × 7mm LQFP and QFN Packages

Typical Application

LTC2389-18 Typical Application
LTC2389-18 Typical Application


The LTC®2389-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC. Operating from a single 5V supply, the LTC2389-18 supports pinconfigurable fully differential (±4.096V), pseudo-differential unipolar (0V to 4.096V), and pseudo-differential bipolar (±2.048V) analog input ranges, allowing it to interface with multiple signal chain formats without requiring additional level translation or signal conditioning. The LTC2389-18 achieves ±3LSB INL (maximum), no missing codes at 18-bits, and 99.8dB (fully differential)/ 95.2dB (pseudo differential) SNR (typical).

The LTC2389-18 includes a precision internal 4.096V reference, with a guaranteed 0.5% initial accuracy and a ±20ppm/°C (maximum) temperature coefficient, as well as an internal reference buffer. Fast 2.5Msps throughput with no cycle latency in the parallel interface modes makes the LTC2389-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2389-18 dissipates only 162.5mW at 2.5Msps, while both nap and sleep power-down modes are provided to further reduce power consumption during inactive periods.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC2389CLX-18#PBF 7mm x 7mm LQFP-48 LX C 05-08-1760 Yes
LTC2389CUK-18#PBF 7x7 QFN-48 UK C 05-08-1704 Yes
LTC2389CUK-18#TRPBF 7x7 QFN-48 UK C 05-08-1704 Yes
LTC2389HLX-18#PBF 7mm x 7mm LQFP-48 LX H 05-08-1760 Yes
LTC2389ILX-18#PBF 7mm x 7mm LQFP-48 LX I 05-08-1760 Yes
LTC2389IUK-18#PBF 7x7 QFN-48 UK I 05-08-1704 Yes
LTC2389IUK-18#TRPBF 7x7 QFN-48 UK I 05-08-1704 Yes

LTC2389-18 Package Drawing
LTC2389-18 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC2389CLX-18#PBF 7mm x 7mm LQFP-48 C $48.43 $33.90 Yes
LTC2389CUK-18#PBF 7x7 QFN-48 C $48.43 $33.90 Yes
LTC2389CUK-18#TRPBF 7x7 QFN-48 C $33.96 Yes
LTC2389HLX-18#PBF 7mm x 7mm LQFP-48 H $64.05 $44.83 Yes
LTC2389ILX-18#PBF 7mm x 7mm LQFP-48 I $55.69 $38.99 Yes
LTC2389IUK-18#PBF 7x7 QFN-48 I $55.69 $38.99 Yes
LTC2389IUK-18#TRPBF 7x7 QFN-48 I $39.05 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1826A-A LTC2389-18 with LTC6655/LT6201, 18-Bit, 2.5Msps, Serial/Parallel SAR ADC with 99.8dB SNR. Req DC718 $150.00
Buy Now

Companion Boards

Part Number Description Price Documentation
DC718C USB Data Acquisition Controller, for PScope Evaluation Kits (<135Mbps) $300.00
Buy Now
Click here to view our complete list of demo boards


  • Medical Imaging
  • High Speed, Wide Dynamic Range Data Acquisition
  • Industrial Process Control
  • Instrumentation
  • ATE

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LinearLabTools is a collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards.  An evaluation board for a data converter will typically plug into an accompanying controller board, which is then connected to a host computer running a Linear supplied GUI program such as PScope for Analog-to-Digital converters or LTDACgen for Digital-to-Analog converters. The GUI allows basic performance measurements to be made, but it is not designed to run arbitrary sequences of tests or communicate with other hardware, as is often required by customers when evaluating a part for their own application. LinearLabTools allows customers to control Linear’s data converter demo boards as they would any other piece of test equipment, using their own software.

The LinearLabTools package also contains various application examples, simulations, and educational programs that demonstrate mixed signal concepts.

Click here for more information and to download the software

Technical Support